docs: def is_zipfile(filename):
      """Quickly see if a file is a ZIP file by checking the magic number.
  
      The filename argument may be a file or file-like object too.
      """
      result = False
      try:
          if hasattr(filename, "read"):
              result = _check_zipfile(fp=filename)
          else:
              with open(filename, "rb") as fp:
                  result = _check_zipfile(fp)
      except OSError:
          pass
      return result